Electric-arc lamp.



W. C. H.'W'EFE'L.

ELECTRIC AR-C LAME, APPLICATION FIL'ED MAY1311912.

3 SHEEHTSQSHEET I.

WITNESSES; 11v VENTOR.

W. C. H, WEFEL.

ELECTRIC ARC LAMP.

APPLICATION FILED MAY 13, 1912.

Patented Aug. 31', 1915..

3 SHEETS-SHEET 2.

r 2 2 V 9 3 E Z 5 3 ZW 2 m r O u V, w r 3 5 5:: 1 m ,Z/A'Mmw M WT/05% 46 V W @m I r INVENTOR, C- f efe/ WITNESSES: (Z41 M W. C. H. WEFEL.

- ELECTRIC ARC LAMP. APPLICATION FILED MAY13| 1912.

1mm Aug. 31, 1915.

3 SHEETS -SHEU 3.

I III II fill! v leting appliance in eleveticn Fig. 2, s verti ir i We i-J ES ii LA 'WIILLIAIJI C. H. WEFEL,

HUNDREDT-HS T0 SAI E'ZITZL E. VII 1 Y ill? DENVER, CO3

Application filed 13,

To all wiwin it may concern:

Beit known that L'WiLLiAM G WrJFEL, e citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have inventecl certain new useful Improvements inElectric-Arc Lamps of which the following is a specification.

This invention relates to new and useful improvements in electric arc lamps an i principal object resides in the provision of a regulating mechanism'ccmposed of sssccietich, of simple mechanical and sle-ch cal devices by means of which the electrodes are automatically re-erljustecl t0 their preps;- rlistance When-the interval between them he comes too long for the prcrluction of a steady flame but before it'lms increased to an extent too great for the passage of current. from one electrode to the other.

Other objects of my lHVGDtlORI'GSldQ in the novel arrangement of the psrts and. in details of construction, all of which will be fully described in the following specifics-- tion, reference being hacl to the acccmp i; ing drawings in the several views or" which, like parts are similarly clesignetezl, end in which,

Figure 1 represents a vertical thrcugh thelemp casing showing the reguticnalview of the casing in which the volt; ic

arc is produced, and adjacent parts of the "iemp, Fig: i, an enlarged view of the ends of the carbons, and adjacent parts of the regulating rcechenisrh 5 1i eclec c view of rhe eiicls cf the carbons and the jecent parts of the regulating mechanism in the pcsiticii theyiiormelly c-Qc -i y lur section taken alcng'thc lim 1 W r S. e section when mung 5- incl 9, c section 0 0' v I openings er cr' cssimi I slight iii e iioriseitei Eleii'ers Serial lie. 61?

cal direction which are ccvererl by means of lenses and lithe light passing through i5 is concentrate-(l. by means sting funnel 6 prehle she "ter 7 by means of li ht from the lamp J- n the upper ci an inwarr I v.1 led with 2m :15 oi which the pzissm th lens he c etru red. The electrodes 8 of the arc-lamp are placed convergen tubular holders from the circ and which iii 01 caps 1t omitted leeves 9 secured. in

r-ztencl outwardly .vsll of the shell. c, are close; by means =31f the sleeves 9 are 1 M -1- elicit cllUGS 13 so that when the Cfll'bOIlS have been re.

i lirigth, this fact may he a surrocnr thcrinore pro as s e to that closed L she vertical lens as in The drawings is closed by a cap 1.? camrl. 0i "1 opaque substance adapters. fleet e light, While spen- 1 an eiectrccnsgiiet heir upper ends appearing- 23, the vertically movable core 24 of which is pivotally suspended from a lever 25 which is fulcrumed upon a standard 26 mounted on a base 27 which issupported upon the bottom of the shell 2. A spring 28 connected at its ends to the short arm of the lever 25 and to a laterally projecting bracket 29 on the standard 26, is provided to maintain the lever, during deenergization of the magnet, in its normal position in which it engages an adjustable stop 30 on the standard 26. The long arm of the lever is pivotally connected with a tubular rod 31 which at its upper end, supports a metallic head 32 which has a tongue adapted to enter the interval between the ends of the electrodes during the period of their re-adjustment, and which in this operation, serves to provide by means of said tongue a stop which determines the normal length of the are between the electrodes and completes the main operating circuit after the'latter have been adjusted to their proper distance.

The rod 31 has a vertical reciprocating movement in a hollow standard 55 which is erected on the before-mentioned base 27 and it is rigidly connected with across-head 33 of non-conductive material, which at its'encls carries the devices by means of which the electrodes are clutched in their adjusted position in the sleeves 9 While the lamp is in operation. These devices consist of levers 34 which are fulcrumed at the connected ends of bands 35 secured around the-respective sleeves and which are adapted to frictionally engage with their short arms, the surfaces of the respective electrodes through openings in the sleeves 9. The long arms of the levers 34 are movably connected with rods 36 which are slidably mounted in bear.

ings 37, lined with insulating bushings which form part of the cylindrical Wall of the casing 14.

The lower portions of the rods 36 are threaded and project loosely through openings in the ends of the cross-head 33. Nuts 38 screwed upon the rods engage the upper surface of the cross-head while nuts 39 applied at the lower ends of the same, serve as abutments for springs 40 which are coiled around the rods to engage the lower surface of the crosshead.

\Vhen the reciprocating rod 31 is in its lowered position during the period of illumination of the lamp, the ends of the levers 34, are, by reason of the depressed position of the cross-head and through the instrumentality of the springs 40, maintained in frictional contact with the electrodes. When the rod 31 is subsequently moved upwardly, the springs 40 will maintain the clutch levers 34 in engagement with the electrodes until the head at the end of the rod, has assumed its position between the electrodes, as shown in Fig. 4, and when the said rod is again moved downwardly to withdraw the stop 32 from the said interval, the springs 40 willact to immediately move he levers 34,130 the position in which they hold the electrodes against gravitative movement.

The lever 25 is connected at the end of its long arm with the vertically, sliding rod 41 of a circuit breaker 42 which controls the shunt circuit hereinafter to be described, and which consists of two flexible blades 43 secured at opposite sides of an insulating block -14, and respectively connected with the ends of a conductor 45 in a break in the said shunt circuit. A metallic cross-piece 46 at the end of the rod 41 is constructed to engage the contact blades 43 when the rod is in its lowered position.

The main operating circuit of thelamp includes a source of.electricity 47 and conductors 48 and 49 which at their ends are connecter' with binding screws 50 secured around the electrode-sleeves 9, and the windings of the magnetic coil 23 are connected in the conductor 48 which is attached to the binding screw on the sleeve of the negative electrode. The hereinbefore mentioned shunt circuit, designated by the numeral 45, includes a resistance coil 51, and one side of this circuit, in which the circuit-breaker 42 is disposed, is connected with the conductor 48 of the main circuit as at 52, while its other side has its terminal in the bifurcated extremity of a rod 53 which is fixedly secured in insulated relation to the casing 14 and whose ends straddle the lower portions of the electrodes 8 in spaced relation to the" upper surfaces thereof, as is clearly shown in Fig. 7 of the drawings.

During the period of illumination when the points of the carbons 8 are at the proper distance from each other and the current passing through the lamp is at its normal voltage, the voltaic are passing between the carbon points is naturally steady; the magnetic coil being energized, maintains its core in the retracted position, with the clutch levers 34 holding the electrodes immovable in the sleeves 9 and with the head 32 at the end of the reciprocating rod 31, in its lowcred position, while the circuit breaker 42 in the shunt circuit is closed. The various parts remain in thisposition during the period of illumination until by burning away of the carbons, the are between their extremities is lengthened to a predetermined extent or until the current becomes too weak by the irregularities in the strength and supply of the current in a circuit of this character, when the flame becoming unsteady, will arch and assume a higher position on the carbons with the result that the are touches the bifurcated extremity of the ter- .minal rod 53 and thus closes the shunt circuit which is normally open at this point.

The closing of the shunt circuit excludes the magnetic coil 23 temporarily from the path of the current and the magnet being thus deenergized, causes the spring 28 to move the rod 31 upwardlythrough the instruinentality of the lever 25, until its head 32 has entered. the interval between the car bon points, .while by movement of the clutch levers, the electrodes are Simultaneously released.

The electrodes impelled by gravity, move downwardly nitil they engage the stop which determines the proper distance be tween its points and which being composed of conductive material, completes the main circuit with the result that the magnet is again energized and the various parts of the regulating mechanism are restored to their original position.

By breaking the shunt circuit by means of the circuit-breaker 42, the moment it has performed its function in temporary cluding the electric magnet from the circuit,

the flow of electricity through the lamp will,

in case one or the other of the carbons is missing either by accident or, by being entirely consumed, be discontinued until the defect-has been remedied.

it will be understood that the ohmage of the resistance in the shunt circuit should at least be equal to the resistances of the normal arc and the magnetic coil and that in asmuch as it is the purpose of the resistance to prevent variations in the load on the dyname or other sourceof electricity luring the readjustment of the electrodes, the same may be omitted in cases Where the resistance is already included in the main operating circuit, as for example, the circuit of electric tramway system.

Themetallic casing ii in Which the is produced has been found to provide an effective substitute for the fragile globes heretofore employed, and While the mechanism shown and described is the best at present lmown to me to effectively carry out the functions of my invention, I desire it understood that variations in their arrange ment and construction may he availed of within the scope of the claims,

I claim- 1. In an arc lamp, a. pair of convergent electrodes movable toward each other by gravity and connected in a main circuit, an electromagnet in said circuit, a sp1'ing-con-- trolled lever operatively connected with the armature of the magnet, a vertically reciprocating device below the arcing ends of armature of the in closed and thus temporarily eXo magnet from the path The carrying a conductive step adapted to e electrodes Whe the cc .i levers ed to clamp the electrodes in their pcsitions, a cross-head connected device, rode on said c c with said clutch levers o as to =5 electrodes during Y into the interval, effect;

temporary delinergi on the when the normal con ition of the vol-tar is varicdtc a determinate extent.

2. In. an arc lamp, pair of conve electrodes movable toward each othe gravity and conxiiected in a l .1 *c' elcctro-magnet in said circuit, trolled lever ogerativel pair of electrodes in main circuit, an e ctro-magnet in circuit, means norina v holding said electrodes-and adapte' operate permit ting a feeding movement of the me, shunt-circuit having a terminai the interval between the electrodes connected in a side the'ina n circu t, to he current the normal condition Q the voltaic arc varied so as to establish an electric connection between said terminal ing the shunt-sire i testimony signature in presence Wit Ronni mints, ll. finer-inns 

